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(I tried shading one of your characters in grayscale, using a combination of the airbrush + the paintbrush, or what we would call the "Hard Round Brush" in Photoshop)
This is a really horrific painting demonstration; in fact, I hope it's so infuriating and awful that it causes somebody much better than me to show up and give you even better advice :)
(I'm really just trying to show how one of the first steps you can take in rendering is just playing around with random spheres / blobs of form)
(Pen pressure does have to be on to shade in this style though)
Seems like this entire board wants to see you make it!